Bronze alloy and process for its production



7 Alloys and Processes for Their with this invention consist,

PETER os'rnimonr, or nnnimonr, AUSTRIA.

BRONZE ALLOY AND PROCESS FOR ITS -.PROIJI'J'(.l'IIOIN'.

Ho Drawing.

To all whom it may cmwem:

Be it known that 1, PETER Os'mrrnonr, a- Prussian subject, residing at Berndorf, Lower Austria, have invented new and useful Improvements in and Relatin to Bronze roduction, of which thefollowing is a specification.

The present invention relates to novel bronze alloys which in their composition closely resemble genuine bronzes, but differ from them essentially and advantageously, in that they are capable of being easily worked in the cold state and also possess whilst in the hot state, an adequate degree of suitability for working.

It is well known, that genuine bronzes, consisting of copper and tin, are in practice almost unworkable, and therefore have a very limited range of use. In particular, such bronzes cannot be employed for the manufacture of such parts as require, after the casting operation, a further tooling of' any kind.- On the other hand it would be desirable, for'many purposes, if the good properties of these genuine bronzes could be utilized.

Attempts have, in fact, already been made at improving bronzes consisting of copper and tin by the addition of other metals such as nickel and zinc. In such alloys, however, the percentage of tin was comparatively small, whilst the percentage of zinc was comparatively large, and, therefore, products resulted which were not serviceable for practical purposes, and which did not show, in an adequate measure; the desirable properties of genuine bronzes.

The invention consists in compounding 87 parts by weight of copper with 4.5-10 parts by weight of tin, 1-5 parts by weight of.

nickel and not more than 5 parts by weight of zinc to produce the improved bronze alloy.

According to this invention, important improvements of copper and tin alloys are obtained by making suitable additions of nickel and zinc and by suitably adjusting the proportions of these additions it is possible to produce, a softer or harder material as required. Bronzes made in accordance generally speaking, of at least 87 parts o copper, 4.5-10 parts of tin, 1-5 parts of nickel and not more than 5 parts of zinc. In compounding the alloy, the copper and nickel are first melted together, then the tin is added, and finally Application filed October 4, 1922. Serial a... 592,410.

the zinc. A percentage of 'zinc exceeding 5% isanot admissible, because zinc has the property of rendering the alloy soft but this softening is only .obtained when the percentage of zinc does not exceed 5%, if the percentage of zinc is increased beyond this limit, the alloy again becomes harder.

Castings suitable for use with superheated steam can be produced if the improved alloys, as such alloys can'be relied upon to stand temperatures up to 500 (C.), which is due tothe fact that the cast metal is very dense and articles made therefrom are not drawn into wire, and annealed so as to be softened, has a tensile strength of 28% tons per square inch with 60-65% elongation whilst hard-drawn wires of the alloy have a tensile strength of up to 661} tons per square inch.

A harder alloy which is particularly suited for the manufacture of springs of all kinds, for example :-the springs of press buttons, in which it is of importance to have an exceedingly strong material which will retain its resilience :contact blades for telephonic andsimilar apparatus and many other like purposes, with great advantage, may consist of 88 parts of copper, 7.5 parts of tin, 2.5 parts of nickel and 2 parts of zinc.-

This material, when drawn and annealed so as to be softened has a tensile strength of 35 tons per square inch with about 45% elongation.-

The new bronze alloys composed in ac cordance with this invention are much superior, for many purposes of use, to any of the materials now available, and it has. already been ascertained by experiments, that paper-making wires of a soft bronze alloy as hereinabove described are still perfectly serviceable after a period of use twice as long as that obtainable with the best papermaking wires hitherto available.

I claim:

1. An improved bronze alloy consisting of not less than 87 parts by weight of copper, 413x010 parts by weight of tin, 1 to 5 to the molten mixture and finally adding parts by weight of nickel and 1 to 5 parts the zinc. by weight of zinc. In testimony whereof I have signed this '2. An improved bronze alloy consisting of specification in the presence of two wit- 5 88 parts by weight of copper, 7%},part's'by .-nesses.

weight of tin, 2% parts by weight of nickel and 2 parts by weight of zinc." i i P. OSTENDORF. I

3. A process for obtaining an improved Witnesses: bronze alloy consisting in melting the cop- I CARL WIEDENBERG,

' 10 'per together with, the nickel, adding the tin JoHANN' KUHN. 

